Hadith
Riyad as-Salihin #572
The Book of Virtues· كتاب الفضائل
riyad_as_salihin:572وعن ابن عباس رضي الله عنهما أن رسول الله صلى الله عليه وسلم صام يوم عاشوراء، وأمر بصيامه. ((متفق عليه))
The Messenger of Allah (ﷺ) observed Saum (fasting) on the day of 'Ashura' and commanded us to fast on this day..
Hadith text and chains are sourced from publicly available compilations. PeaceSIM’s rijal engine cross-links each narrator to its biographical profile where available.